The processing technology of PS plastic mainly includes injection molding, extrusion molding and foam molding. It is widely used in the automotive industry, electrical products, transparent products, daily necessities, etc. The following specifically introduces the "processing technology and application of PS plastic".
1. Processing technology of PS plastic
1. Injection molding
Use an ordinary injection molding machine. When the product thickness is in the range of 2.3 to 3mm, the ratio of the limit flow length to the thickness is 200:1, the demolding angle is not less than 1°, and the depth of the vent hole is less than 0.03mm. The temperature difference of the die temperature is less than 3～6℃. The specific injection molding process conditions are: molding temperature 180-215 ℃, injection pressure 30-150 MPa, and mold temperature lower than 70 ℃.
2. Extrusion molding
PS can be processed on an ordinary extruder, and the extruded products include pipes, rods, sheets, films, fibers, etc. After molding, the strength is low and brittle when it is not stretched, and the transparency, gloss, strength and toughness are obviously improved after stretching. The extrusion molding temperature of PS is between 150 and 200 ℃.
3. Foam molding
Using GPPS as a raw material, foaming agents are divided into chemical foaming agents and physical foaming agents. Adopt one-step extrusion, directly mix the foaming agent with PS or inject the physical foaming agent into the PS melt in the extrusion melting section, extrude and foam, and then cool. The foam made of GPPS has the advantages of fine cells and high strength. The main products of high-foaming materials are blister packaging materials such as fast food lunch boxes, art decorative panels and foamed nets, and low-foaming materials include imitation wood profiles, sheets, boards and so on.
Second, the application of ps plastic
1. The automotive industry
The main applications of PS materials in automobiles are instrument housings, lampshades, and lighting products. Polystyrene can also be used to prepare packaging materials and thermal insulation materials through foam molding, used to produce ceilings, and graft copolymerization and modification with other materials to obtain many fixed and matched PS family alloy plastic varieties, such as SMA In the manufacture of car dashboard skeletons.
2. Electrical products
PS material has both transparency and good insulation, and can be used for accessories, housings and high-frequency capacitors of TV sets, tape recorders and various electrical appliances.
3. Transparent products
PS has excellent transparency and can be used for general optical instruments, transparent models, lampshades, instrument covers and packaging containers, etc.
4. Daily necessities
PS has good coloring and gloss, and can be widely used in the production of daily necessities, including children's toys, decorative boards, tape boxes, furniture handles, combs, toothbrush handles, penholders and stationery.
5. Packaging materials
PS foam has good shock resistance and heat preservation, and can be used for shockproof packaging and insulation materials. Packaging materials are mainly used for electrical appliances, precision instruments, handicrafts, glass products and ceramic products, etc.; insulation materials include partition wall panels and roof sandwich materials Wait.